Why Testing Matters
Test cases are used to test the functionality of the application. In this article, we will learn how to write test cases for an Express application.
Jest
Jest from setup to advanced use — unit testing, mocking modules and timers, async testing, and where snapshot tests help or hurt.
Integration Testing with Supertest
Test an Express API end to end with Supertest and Jest — real HTTP requests, status codes, response bodies, and an in-memory data layer.
Testing Best Practices
The habits that make a test suite worth having — AAA structure, behavior-driven naming, mocking boundaries, regression tests, and a sane coverage philosophy.